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Pan Lu

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#artificial intelligence Preprint Oct 2026

HERA: Harness-Environment Co-Evolution for Reliable Agentic Abstention

Large language model (LLM) agents are increasingly capable of acting in complex tool-use environments, yet they often fail to recognize when tasks are infeasible and no valid solution exists. Recent work has formalized this reliability gap as the problem of agentic abstention, and existing approaches typically optimize...

Hang Luo, Bing-Bing Wen, Guang Yang et al. · 0 citations
#natural language process... Preprint Sep 2026

Spurious Tool Use: When RL Agents Learn the Wrong Reason to Act

A dense, decision-level reward is introduced in which an LLM judge evaluates the necessity of each tool call, which effectively suppresses cue-driven tool use while preserving task performance, providing a practical approach to improving the robustness of LLM agent tool-use policies.

Yi-Wei Yang, Hao-Xiang Zhang, Bing-Bing Wen et al. · 0 citations

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